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Vincent LE GARREC discovered an integer underflow in pixman. If a user weretricked into opening a specially crafted file, a remote attacker couldcause pixman to crash, resulting in a denial of service, or possiblyexecute arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the followingpackage versions:

Ubuntu 14.04 LTS: libpixman-1-0 0.30.2-2ubuntu1.1

Ubuntu 12.04 LTS: libpixman-1-0 0.30.2-1ubuntu0.0.0.0.3

After a standard system update you need to restart your session to makeall the necessary changes.